Atrazine, one of the most widely used herbicides in the United States, is commonly applied to southern lawn grasses to reduce weed encroachment. According to the EPA, atrazine is also one of the most frequently identified herbicidal compounds in surface and ground waters. Given the increased management intensity of home lawns in Louisiana, coupled with urban sprawl and high rainfall has led to a higher potential for movement of atrazine into surface waters during runoff events. Experiments were conducted at the LSU AgCenter Burden Botanic Gardens on centipedegrass (Eremochloa ophiuroides) at a 5% slope to evaluate the effect of atrazine formulation and post application management on atrazine movement. Atrazine was applied as a granular or liquid and either incorporated with 1.25 cm of irrigation or not incorporated. Four days post-atrazine application, treatment combinations were subjected to rainfall simulation at 5.5 cm hr-1 for 30 min of surface runoff. All herbicides exhibited the highest loss at 4 DAT followed by declines in losses with subsequent surface runoff events. In both experimental runs, granular atrazine resulted in lower total atrazine runoff losses compared to liquid applied atrazine. However, in the second experimental run irrigation reduced liquid applied atrazine 36% from unincorporated liquid applied atrazine. When simazine was compared to atrazine following the same application parameters, simazine resulted in >90% total reduction in herbicide losses compared to atrazine. Based on this research atrazine losses from surface runoff can be mediated through application of granular applications, irrigation when liquid atrazine is applied, or selection of simazine for area prone to frequent surface runoff.
| Identifer | oai:union.ndltd.org:LSU/oai:etd.lsu.edu:etd-11132015-120151 |
| Date | 08 December 2015 |
| Creators | Pope, Kimberly Joy |
| Contributors | Beasley, Jeffrey S., Strahan, Ronald E., LeBlanc, Brian D. |
| Publisher | LSU |
| Source Sets | Louisiana State University |
| Language | English |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://etd.lsu.edu/docs/available/etd-11132015-120151/ |
| Rights | unrestricted, I hereby certify that, if appropriate, I have obtained and attached herein a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee. I hereby grant to LSU or its agents the non-exclusive license to archive and make accessible, under the conditions specified below and in appropriate University policies, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report. |
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